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Cyanide works by making the human body unable to use oxygen.
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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

